Pruning Roses That Bloom All Season

For the first 2-3 years after planting, prune only to remove dead,
damaged, or crossing wood (stems that are rubbing against another
stem--remove the weakest one). You've got to let the main stems grow
tall. You'll be training them during this time.

Climbing roses
bloom most heavily when their stems are trained horizontally; so don't
just tie them straight up whatever support you are using.

Fan the stems out. A wall works better for this than a trellis.

If
you've got to use a trellis, use the widest one your space will permit.
You'll be glad you went to the extra trouble when you see the number of
flowers that result.

Branches trained along the horizon or pegged to the ground produce
many more laterals than branches that are allowed to grow straight up.
The blooms will also occur at a lower height where they can be seen and
appreciated. Pegging gives the most spectacular flower show if you can
spare the space.

To peg a climbing rose, let the main stems
grow long. While they are still flexible, bow them over gently and peg
their tips to the ground using bent wire. Pieces of wire coat hangers
bent into a U shape will work. Try to peg the stems an equal distance
apart in a big circle. If you don't have room for a circle, use half as
many stems and do a half circle. The half circle works well for roses
that are planted against a wall.

Once you've established your framework, this is how you will prune the rose each year:

Remove any old, unproductive stems to make room for fresh
replacements to grow. Otherwise, only head back the main canes if they
are outgrowing their allotted space.

Head back the laterals to 2 or 3 buds.

During
the growing season, cut the laterals back to a bud 3 leaves above the
main stem after they flower. This will encourage rebloom.

How to Prune Climbing Roses That Only Bloom Once

Remove obviously unproductive older canes that show no signs of
shooting by cutting them to the ground. Cut all other canes back to any
strong growth they are producing. This new growth is where next springs
blooms will form.